DROP COLLATION
DROP COLLATION — remove a collation
Synopsis
DROP COLLATION [ IF EXISTS ] name [ CASCADE | RESTRICT ]
Description #
DROP COLLATION removes a previously defined collation. To be able to drop a collation, you must own the collation. 
Parameters
- IF EXISTS
- Do not throw an error if the collation does not exist. A notice is issued in this case. 
- name
- The name of the collation. The collation name can be schema-qualified. 
- CASCADE
- Automatically drop objects that depend on the collation, and in turn all objects that depend on those objects (see Section 5.14). 
- RESTRICT
- Refuse to drop the collation if any objects depend on it. This is the default. 
Compatibility #
 The DROP COLLATION command conforms to the SQL standard, apart from the IF EXISTS option, which is a Postgres Pro extension.